Roadie — Automatic Guitar Tuner for iPhone

A guitar tuner to geek out over, Roadie is a beautiful example of what can happen when you carry a supercomputer in your pocket. Roadie connects to your iPhone with Bluetooth. The app listens to you strum the strings of your guitar and tells the tuner how much to spin the pegs. It also lets you know when you need new strings.

Gosh darn I want this.